CVE-2022-49963
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-06-18

Last updated on: 2025-11-14

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: drm/i915/ttm: fix CCS handling Crucible + recent Mesa seems to sometimes hit: GEM_BUG_ON(num_ccs_blks > NUM_CCS_BLKS_PER_XFER) And it looks like we can also trigger this with gem_lmem_swapping, if we modify the test to use slightly larger object sizes. Looking closer it looks like we have the following issues in migrate_copy(): - We are using plain integer in various places, which we can easily overflow with a large object. - We pass the entire object size (when the src is lmem) into emit_pte() and then try to copy it, which doesn't work, since we only have a few fixed sized windows in which to map the pages and perform the copy. With an object > 8M we therefore aren't properly copying the pages. And then with an object > 64M we trigger the GEM_BUG_ON(num_ccs_blks > NUM_CCS_BLKS_PER_XFER). So it looks like our copy handling for any object > 8M (which is our CHUNK_SZ) is currently broken on DG2. Testcase: igt@gem_lmem_swapping (cherry picked from commit 8676145eb2f53a9940ff70910caf0125bd8a4bc2)
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Meta Information
Published
2025-06-18
Last Modified
2025-11-14
Generated
2026-05-07
AI Q&A
2025-06-18
EPSS Evaluated
2026-05-05
NVD
CVE-2022-49963
Affected Vendors & Products
Showing 4 associated CPEs
Vendor Product Version / Range
linux linux_kernel 6.0
linux linux_kernel 6.0
linux linux_kernel 6.0
linux linux_kernel From 5.15.160 (inc) to 5.16 (inc)
Helpful Resources
Exploitability
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AI Powered Q&A
Can you explain this vulnerability to me?

This vulnerability is in the Linux kernel's drm/i915/ttm component related to CCS (Color Control Surface) handling. It involves improper handling of large objects during memory copying operations in migrate_copy(). Specifically, integer overflows can occur with large objects, and the copying mechanism fails for objects larger than 8MB due to fixed-size windows used for mapping pages. For objects larger than 64MB, a bug is triggered (GEM_BUG_ON) because the number of CCS blocks exceeds the allowed transfer limit. This results in broken copy handling on DG2 hardware.


How can this vulnerability impact me? :

The vulnerability can cause failures or crashes in the graphics memory management on affected systems, particularly when handling large memory objects (>8MB) on DG2 hardware. This may lead to instability or unexpected behavior in graphics operations, potentially affecting system reliability or performance.


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